634642380 has 72 divisors (see below), whose sum is σ = 1991480400. Its totient is φ = 163400832.

The previous prime is 634642367. The next prime is 634642391. The reversal of 634642380 is 83246436.

It is a happy number.

634642380 is a `hidden beast` number, since 6 + 3 + 4 + 642 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55570 + ... + 66009.

It is an arithmetic number, because the mean of its divisors is an integer number (27659450).

Almost surely, 2^634642380 is an apocalyptic number.

634642380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634642380 is an abundant number, since it is smaller than the sum of its proper divisors (1356838020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634642380 is a wasteful number, since it uses less digits than its factorization.

634642380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121623 (or 121618 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 634642380 is about 25192.1094789619. The cubic root of 634642380 is about 859.3624172791.

The spelling of 634642380 in words is "six hundred thirty-four million, six hundred forty-two thousand, three hundred eighty".